var speed = 30;
//速度数值越大速度越慢
var colee_left2 = document.getElementById("colee_left2");
var colee_left1 = document.getElementById("colee_left1");
var colee_left = document.getElementById("colee_left");
colee_left2.innerHTML = colee_left1.innerHTML;
function Marquee3() {
    if (colee_left2.offsetWidth - colee_left.scrollLeft <= 0){//offsetWidth 是对象的可见宽度
        colee_left.scrollLeft -= colee_left1.offsetWidth//scrollWidth 是对象的实际内容的宽，不包边线宽度
    }
    else {
        colee_left.scrollLeft++;
    }

}
var MyMar3 = setInterval(Marquee3, speed);